Gurpreet Kaur, S. K. S. S. “Performance Comparison of Integrated Modified Differential Phase Shift Keying (MD-DQPSK) and DQPSK in Dim Integrated OCDMA System”. International Journal of Advanced Science and Technology, Vol. 28, no. 19, Dec. 2019, pp. 904 -09, http://sersc.org/journals/index.php/IJAST/article/view/2678.